The following is a summary of the 2009–10 season of competitive football in Switzerland.
AC Bellinzona as 9th-placed team of the 2009–10 Super League played a two-legged play-off against Challenge League runners-up AC Lugano for a spot in the 2010–11 Super League.
Bellinzona won 2–1 on aggregate and remain in the Swiss Super League. Lugano remain in the Swiss Challenge League.
FC Emmenbrücke is relegated to the 2. Liga Interregional.
YF Juventus win 7–2 on aggregate
Rapperswil-Jona win 8–2 on aggregate
Delémont win 5–2 on aggregate
Chiasso win 3–1 on aggregate
Delémont win 5–3 on aggregate and achieve peomotion
Chiasso win 3–0 on aggregate and achieve peomotion
The winners in the quarter-finals played in this round. FC St. Gallen had beaten FC Luzern 4–1, FC Lausanne-Sport had also beaten Young Boys 4–1, SC Kriens won 2–1 against FC Thun and Basel had been 3–1 winners against Biel-Bienne.
Note: Fair game, no yellow cards
Zürich won 5–3 on aggregate.
Zürich won 5–1 on aggregate.
Young Boys 2–2 Athletic Bilbao on aggregate. Athletic Bilbao won on away goals.
Basel won 7–1 on aggregate.
Basel won 5–3 on aggregate.
Basel won 8–2 on aggregate.
Fenerbahçe won 4–2 on aggregate.
Vaduz won 2–1 on aggregate.
Slovan Liberec won 3–0 on aggregate.
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